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"His first wife was Grace ___, who was the mother of all his children. She died Feb. 1 [sic], 1680, a. 59."
Grace the wife of Jn'o French died Feb'y last, 1680.[Note: by typical usage, the year would be 1680/81, which is not a leap year (1679/80 would be a leap year). Hence the last of February would be the 28th.]
[John French's] "wife Grace d. Feb. 28, 1680-1, a. 59. [Grave-stone.]"